Means for locking nuts upon bolts



m 26, 1925. v 1339,2i3

G. SHAW MEANS FOR LOCKING NUTS UPON BOLTS Filed March 29, 1923 Patented May 26, 1925.

UNITED STATES GEORGE SHAW, 0F .AS HTON-UNDER-LYNE, ENGLAND.

MEANS non LooKING NUTS uPoN noL'rs.

' Application filed March 29, 1923. Serial No. 628,629.

To all whom it may concern:

Beit known that I, GEORGE SHAW, subject of the King of Great Britain and Ireland, and resident of ASl'ItOIPUHClGPLYDB, in the county of Lancaster, England, have invented a new or Improved Means for Locking Nuts upon Bolts, of which the following is 'a specification. H

These improvements relate to nuts for use upon bolts and to means for locking the said nuts upon their bolts, and, more spe- I cifically, to. nuts and lockingmeansthera for wherein the nut is provided with a cen tral recess for the reception of a central tubular boss of a locking stud, such as described in the specification to my prior British Patent No. 184245dated the 3rd May 1921 The object of these"improvements is to provide locking means for a nut upon a bolt or the like which means will give a maximum of efficiency and will be simplein operation and inexpensive in construction.

l/Vith this object in View, I provide the nut with a recess as indicated in my previous specification above referredto, and a locking stud having a tubular boss also as disclosed in the said previous specification.

By these present improvements however, the boss of the locking stud is formed eccentrically to the bore of the nut, and the said boss is so formed as to be radially compressible, as for instance by saw cuts formed therein. The recess in the nut is formed to receive the tubular boss, that is to say, it will also be eccentric to the bore of the nut. The locking stud being engaged with the nut recess and the two being placed upon a threaded bolt, angular movement of the locking stud in relation to the nut Will, owing to the eccentricity of the tubular boss, have the effect of jamming the outer periphery of the locking stud boss against the inner wall of the nut recess, and, the angular movement proceeding, the tubular boss will be pressed radially inwards upon the bolt thread, thus forming a very ef- The improved locking means render the employment of different hand thread upon the bolt, e. gLa right hand thread for the nut and a left hand thread for thelocking stud, unnecessary. v a The improvements will now befully. describedfwith reference to the accompany,- ing drawings, which are allto scale, and in which Figure 1 is an elevation of a nut showing the central recess thereinz Figure 2 is an elevation" of the locking stud showing the tubular boss: Figures 3 'and4 are plans of the-nut of Figure 1, and of the locking stud ,ofFigure 2 respectively; Figures 5 and 6 are respectively across section and a side elevation of the combined nut and locking stud upon a bolt; 1

Figure 7 is an end elevation of the. combined nut and locking stud showing the position of alockingpin therein: and l Figure 8 is a cross section showing a grub screw substituted for the locking pin of Figure'7. The nut '9, Figures 1 and 3, may have the usual outward formation, a hexagonal nut being shown in the drawings. "It-is provided with a recess 10, and its bore llis" tapped for engagement with the thread of a bolt 12 as usual. The locking studlS, Figures 2 and 4, is formed with a tubular boss 14 provided with saw cuts 15, and an internally threaded bore 16 for engagement upon the bolt. It will be seen on reference to Figures 1 and 2 that whereas the bore 11 of the nut 9 is concentric to the said nut, and the bore 16 of the locking stud 13 concentric with the said stud, the latter bore 16 is eccentric to the stud boss 14. The circular wall of boss 14 varies therefore in thickness, as clearly shown in Figure 2, and the recess 10 in the nut 9 is formed according ly to receive the boss 14 with an easy sliding fit. Figures 5' and 6 show the locking stud boss 14 inserted in the nut 9, the eccentricity of the said locking stud boss to the bore 11 of the nut being clearly shown in Figure 5 in section. The nut 9 and looking stud 13 being put together as in Figures 5 and 6, and placed upon the bolt 12, the two are screwed up together upon the bolt in the manner of a single nut until the face of the nut abuts against the work. The nut 9 then being held by means of a spanner or other suitable tool, the locking stud 13 is screwed up singlyfupon -thebolt,With the result that the thicker portion a, of the clocking stud boss (Figures 2 and 5) "comes against part of th'e inn'er "Wall ofthe're'cess of the nut 9 as shown in the same figure. Continued screwing thus te'iidsto force the outer face of the tubular boss 1i against the inner face of the recess 11), and owing to the saw cuts 15 the Walls of the locking stud bo'ss are "pressed tightly 'radiallyf upon the bolt thread, thus forming a Very efii- Ciiit lojckffor the "nut 9, "and estalilishing a high frictional grip between the nut and its locking stud. j V 2 The outer face of nut 9, and of the lockingTstiid '13 may be groov'ed as'sho'W-n at 17 for the "guidance of' the operator. "The locking stud may be easily inserted in the reeess'lo ofthenut Qtvhnthe grooves 17 on both members "register, this being the non-rock 'positien. v

I In Figure 7'i's'ill'ustrated't he application (if a Iockin inj tfoithe nut and locliingf' st'ud j'u's't descriloed. 18is'a iockingipi n, which may be cylindrical or tapered, 'andywhich passes through holes in the fa'ee'of the nut 9 "and engages fwithin a roov 19 forined around the periphery "of" the t'ubu1ar boss The latter ibeilig 'eecentricto the 'bore 16 'ofthe Stud 13, 'ma'c'hiningsayin'a latlie by ordinary means of the said groov e "'Will have the"ffe'ct that the depth thereof Will graduauy'va'ry. The inserti'onof thepi n 18 will therefore effectually prevent the moyment of the locking stud 13 longitudinally upon the bolt-and relatively :to'the gut; and'furthe'r, owi'ng'to the eccentricity of} the "groove '19 in relation to the" boss '14, Will -act'asaflirther, preventative to" the an- Figure 3,"a set screw omgrub screw 20 may be used as-the means for locking the nut 9 and stud 13 together. In this case a hole is drilled in the nut 9, radially to the bore thereo flas shown in Figure 8, and tapped for the reception of the screw. The end of the latter engaging inthe groove '19 "will have the same 'e-iiect asthe engagement of the 'loc'li'in'g pin 18 in" the said groove.

The saw cuts 15 may be omitted in' any case "Where it is considered that-the tubular boss His sufiicientl'ycompressible Without them to obtain the "desired gripping "e'fe'ct upon the bolt thread.

Means for locki'nga threaded nut upon itsbo'lt, comprising "a central smooth bored recess insaid nutfa locking 'studhore'dand threadedto fit upon the bo'lt,-a radially compressible tubular boss upon the lo'cki'ngst ud to engage in the nut'rece'sgtheouter Wall of the "said tubular boss being eccentric to the"said inut recess, a peripheral groove formed eXteriorl'y upon the"tubular boss,"the. said jgroo've being concentric with "the bore ofithe nut. and eccentric to the boss of the-locking stud, and an orifice inthe' nut through which a "locl'zi-ng device "may "be pressed to engage ithimthe groove and prevent relative radial j movement I of the bolt and'locking' stud and maintain thejgrjip ofthelatter upon't'he bolt thread.

"In testimony" whereof I I have hereunto "set my'hand. 

